mp4_header.h

<VC++视频音频开发>一书的光盘资料。

#ifndef _MP4_HEADER_H_
#define _MP4_HEADER_H_

#define VO_START_CODE		0x8
#define VOL_START_CODE	0x12
#define GOP_START_CODE  0x1b3
#define VOP_START_CODE	0x1b6

#define I_VOP		0
#define P_VOP		1
#define B_VOP		2

#define RECTANGULAR				0
#define BINARY						1
#define BINARY_SHAPE_ONLY 2 
#define GRAY_SCALE				3

#define STATIC_SPRITE			1

#define USER_DATA_START_CODE	0x01b2

#define NOT_CODED -1
#define INTER			0
#define INTER_Q	  1
#define INTER4V		2
#define INTRA			3
#define INTRA_Q	 	4
#define STUFFING	7

/*** *** ***/

// mpeg4格式的数据结构定义
typedef struct _mp4_header {

	// 视频对象层(vol:Video Object Layer)
	int ident;
	int random_accessible_vol;
	int type_indication;
	int is_object_layer_identifier;
	int visual_object_layer_verid;
	int visual_object_layer_priority;
	int aspect_ratio_info;
	int vol_control_parameters;
	int chroma_format;
	int low_delay;
	int vbv_parameters;
	int first_half_bit_rate;
	int latter_half_bit_rate;
	int first_half_vbv_buffer_size;
	int latter_half_vbv_buffer_size;
	int first_half_vbv_occupancy;
	int latter_half_vbv_occupancy;
	int shape;
	int time_increment_resolution;
	int fixed_vop_rate;
	int fixed_vop_time_increment;
	int width;
	int height;
	int interlaced;
	int obmc_disable;
	int sprite_usage;
	int not_8_bit;
	int quant_precision;
	int bits_per_pixel;
	int quant_type;
	int load_intra_quant_matrix;
	int load_nonintra_quant_matrix;
	int quarter_pixel;
	int complexity_estimation_disable;
	int error_res_disable;
	int data_partitioning;
	int intra_acdc_pred_disable;
	int scalability;

	// 图像组(gop:Group of Pictures)
	int time_code;
	int closed_gov;
	int broken_link;

	// 视频对象层(vop:Video Object Plane)
	int prediction_type;
	int time_base;
	int time_inc;
	int vop_coded;
	int rounding_type;
	int hor_spat_ref;
	int ver_spat_ref;
	int change_CR_disable;
	int constant_alpha;
	int constant_alpha_value;
	int intra_dc_vlc_thr;
	int quantizer;
	int fcode_for;
	int shape_coding_type;

	// 宏块(macroblock)
	int not_coded;
	int mcbpc;
	int derived_mb_type;
	int cbpc;
	int ac_pred_flag;
	int cbpy;
	int dquant;
	int cbp;

	// 额外的或导出的(extra/derived)
	int mba_size;
	int mb_xsize;
	int mb_ysize;
	int picnum;
	int mba;
	int mb_xpos;
	int mb_ypos;
	int dc_scaler;

	int intrablock_rescaled;

} mp4_header;

/*** *** ***/

extern int getvolhdr();
extern int getgophdr();
extern int getvophdr();

extern int __inline nextbits(int nbits);
extern int __inline bytealigned(int nbits);
extern void __inline next_start_code();
extern int __inline nextbits_bytealigned(int nbit);

#endif // _MP4_HEADER_H_